Commit Graph

80 Commits

Author SHA1 Message Date
David Greenman
2f2160da3b Fixed splbio problems in vinvalbuf. Closes PR#2875, although fixed
differently by me.
1997-03-05 04:54:54 +00:00
Bruce Evans
4a8b966013 Attach vfs_sysctl() one level lower so that only the levels below
VFS_GENERIC aren't done in the FreeBSD way.  The previous commit
broke the nfs sysctls.
1997-03-04 18:31:56 +00:00
Bruce Evans
3a76a5949b Merged Lite2's vfs_sysctl(). It doesn't fit very well into FreeBSD's
(phk's) sysctl framework, and I needed special code to disambiguate
the VFS_GENERIC node from the VFS_VFSCONF leaf, so I only converted
the leaves to the FreeBSD framework.  The error handling isn't quite
right.  CSRGS's sysctls seem to return ENOTDIR too much and FreeBSD's
sysctls don't agree with the man page.
1997-03-03 12:58:20 +00:00
Bruce Evans
dc91a89e83 Restored some pre-Lite2-merge source-level compatibility to the mount()
and getvfsbyname() interfaces.  The new interfaces are now hidden from
applications unless _NEW_VFSCONF is defined.  The new vfsconf interfaces
don't work yet.
1997-03-02 17:53:37 +00:00
Bruce Evans
a896f0256c Moved vfs sysctls to where Lite2 put them. No code changes yet. 1997-03-02 11:06:22 +00:00
Bruce Evans
b98afd0d00 Fixed Lite2 merge of spechash simplelocking. It was misplaced in
checkalias() and missing in vfinddev() and vcount().
1997-02-27 16:08:43 +00:00
John Dyson
fd7f690f94 Fix the previous simple_lock fix breakage in the combined
vput/vrele routine.  Fix a panic message.  Fix the vop_nounlock
routine so that "special" filesystems that use it work correctly.
1997-02-27 05:28:58 +00:00
John Dyson
0d955f71a1 Fix the simple_lock problem with the physical I/O buffer code, and
also fix the missing simple_unlock in vrele, and improve vrele/vput
by merging them into one routine.  BDE pointed these problems out.
1997-02-27 02:57:03 +00:00
Bruce Evans
7c1557c4af Fixed unmounting of the root fs. vfs_unmountroot() wasn't fully updated
to do Lite2 locking and vfs_unmountall() wasn't as simple as the Lite2
version.
1997-02-26 15:35:42 +00:00
Bruce Evans
c35e283a80 Merged some missing locking from Lite2:
- getnewvnode() and vref() were missing one simple_unlock() each.
- the Lite2 locking changes weren't merged at all in
  printlockedvnodes() or sysctl_vnode().  Merging these undid
  some KNF style regressions.
1997-02-25 19:33:23 +00:00
Peter Wemm
6875d25465 Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not
ready for it yet.
1997-02-22 09:48:43 +00:00
John Dyson
996c772f58 This is the kernel Lite/2 commit. There are some requisite userland
changes, so don't expect to be able to run the kernel as-is (very well)
without the appropriate Lite/2 userland changes.

The system boots and can mount UFS filesystems.

Untested: ext2fs, msdosfs, NFS
Known problems: Incorrect Berkeley ID strings in some files.
		Mount_std mounts will not work until the getfsent
		library routine is changed.

Reviewed by:	various people
Submitted by:	Jeffery Hsu <hsu@freebsd.org>
1997-02-10 02:22:35 +00:00
Bruce Evans
5131d64e0c Removed option EXTRAVNODES. All versions of FreeBSD-2.x have a sysctl
variable `kern.maxvnodes' which gives much better control over vnode
allocation than EXTRAVNODES (except in -current between 1995/10/28 and
1996/11/12, kern.maxvnodes was read-only and thus useless).
1997-01-16 13:16:10 +00:00
Jordan K. Hubbard
1130b656e5 Make the long-awaited change from $Id$ to $FreeBSD$
This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore.  This update would have been
insane otherwise.
1997-01-14 07:20:47 +00:00
John Dyson
8b612c4b4a This commit is the embodiment of some VFS read clustering improvements.
Firstly, now our read-ahead clustering is on a file descriptor basis and not
on a per-vnode basis.  This will allow multiple processes reading the
same file to take advantage of read-ahead clustering.  Secondly, there
previously was a problem with large reads still using the ramp-up
algorithm.  Of course, that was bogus, and now we read the entire
"chunk" off of the disk in one operation.   The read-ahead clustering
algorithm should use less CPU than the previous also (I hope :-)).

NOTE:  THAT LKMS MUST BE REBUILT!!!
1996-12-29 02:45:28 +00:00
Bruce Evans
b83ddf9c86 Restored writability of kern.maxvnodes. It was broken a year ago in
rev.1.29 of kern_sysctl.c.

Should be in 2.2.
1996-11-12 09:24:31 +00:00
Poul-Henning Kamp
19060a3ad9 init_main.c: pass -d to init if DEVFS_ROOT
kern_conf.c:	gd driver is a disk.
vfs_subr.c:	include opt_devfs.h
1996-10-28 11:34:57 +00:00
Jordan K. Hubbard
0082fb4657 I'm not sure why, but Netcon's TFS filesystem code doesn't want to
add free vnodes back to the freelist.  They must do their own vnode
management.  Anyway, this change is *only* activated with their filesystem
and doesn't affect anyone else.  Whoops, forgot the submitted-by lines
in my previous commits too.. :-(
Submitted-By: Tony Ardolino <tony@netcon.com>
1996-10-17 17:56:07 +00:00
John Dyson
ad98052216 Clean up the rundown of the object backing a vnode. This should fix
NFS problems associated with forcible dismounts.
1996-10-17 02:49:35 +00:00
John Dyson
a8f42fa9a6 Correct vget by removing a window where a vnode can potentially go away. 1996-09-28 03:36:07 +00:00
Nate Williams
030e2e9ebb In sys/time.h, struct timespec is defined as:
/*
         * Structure defined by POSIX.4 to be like a timeval.
         */
        struct timespec {
                time_t  ts_sec;         /* seconds */
                long    ts_nsec;        /* and nanoseconds */
        };

        The correct names of the fields are tv_sec and tv_nsec.

Reminded by:	James Drobina <jdrobina@infinet.com>
1996-09-19 18:21:32 +00:00
John Dyson
6476c0d204 Even though this looks like it, this is not a complex code change.
The interface into the "VMIO" system has changed to be more consistant
and robust.  Essentially, it is now no longer necessary to call vn_open
to get merged VM/Buffer cache operation, and exceptional conditions
such as merged operation of VBLK devices is simpler and more correct.

This code corrects a potentially large set of problems including the
problems with ktrace output and loaded systems, file create/deletes,
etc.

Most of the changes to NFS are cosmetic and name changes, eliminating
a layer of subroutine calls.  The direct calls to vput/vrele have
been re-instituted for better cross platform compatibility.

Reviewed by: davidg
1996-08-21 21:56:23 +00:00
John Dyson
619594e898 Certain vnode buffer list operations were not being spl protected,
and they needed to be.  Brelse for example can be called at interrupt
level, and the buffer list operations were not being protected from it.
1996-08-15 06:45:01 +00:00
Bruce Evans
8c2ff39670 Only use the special bdevvp() for DEVFS if DEVFS_ROOT is defined. This
makes option DEVFS safe to use again (although mounting devfs is unsafe).
1996-07-30 18:00:32 +00:00
Poul-Henning Kamp
e83cf165d6 DEVFS needs a special bdevvp(). 1996-07-24 21:21:43 +00:00
Bruce Evans
cba2a7c614 Staticized a few variables.
Fixed warnings about unused variables.
1996-07-12 07:41:34 +00:00
Peter Wemm
114a8cff43 Add an option "EXTRA_VNODES" to cause an extra number of vnode structures
to be allocated at boot time.  This is an expensive option, as they
consume physical ram and are not pageable etc.  In certain situations,
this kind of option is quite useful, especially for news servers that
access a large number of directories at random and torture the name cache.
Defining 5000 or 10000 extra vnodes should cut down the amount of vnode
recycling somewhat, which should allow better name and directory caching
etc.

This is a "your mileage may vary" option, with no real indication of
what works best for your machine except trial and error.  Too many will
cost you ram that you could otherwise use for disk buffers etc.

This is based on something John Dyson mentioned to me a while ago.
1996-05-31 00:20:34 +00:00
John Dyson
e5fadd05f2 Put the "free vnode isn't" check back in the right place. 1996-03-09 06:43:19 +00:00
John Dyson
bd7e5f992e Eliminated many redundant vm_map_lookup operations for vm_mmap.
Speed up for vfs_bio -- addition of a routine bqrelse to greatly diminish
	overhead for merged cache.
Efficiency improvement for vfs_cluster.  It used to do alot of redundant
	calls to cluster_rbuild.
Correct the ordering for vrele of .text and release of credentials.
Use the selective tlb update for 486/586/P6.
Numerous fixes to the size of objects allocated for files.  Additionally,
	fixes in the various pagers.
Fixes for proper positioning of vnode_pager_setsize in msdosfs and ext2fs.
Fixes in the swap pager for exhausted resources.  The pageout code
	will not as readily thrash.
Change the page queue flags (PG_ACTIVE, PG_INACTIVE, PG_FREE, PG_CACHE) into
	page queue indices (PQ_ACTIVE, PQ_INACTIVE, PQ_FREE, PQ_CACHE),
	thereby improving efficiency of several routines.
Eliminate even more unnecessary vm_page_protect operations.
Significantly speed up process forks.
Make vm_object_page_clean more efficient, thereby eliminating the pause
	that happens every 30seconds.
Make sequential clustered writes B_ASYNC instead of B_DELWRI even in the
	case of filesystems mounted async.
Fix a panic with busy pages when write clustering is done for non-VMIO
	buffers.
1996-01-19 04:00:31 +00:00
Garrett Wollman
0e41ee3037 Convert DDB to new-style option. 1996-01-04 21:13:23 +00:00
David Greenman
864ef7d17e Moved the #ifdef DIAGNOSTIC in vrele() so that the check for negative
v_usecount is always performed and only the call to vprint is conditional.
1996-01-02 18:13:20 +00:00
Poul-Henning Kamp
27a0b398a7 Staticize.
Unstaticize a function in scsi/scsi_base that was used, with an undocumented
option.
My last count on the LINT kernel shows:
Total symbols:  3647
unref symbols:   463
undef symbols:     4
1 ref symbols:  1751
2 ref symbols:   485
Approaching the pain threshold now.
1995-12-17 21:23:44 +00:00
John Dyson
a316d390bd Changes to support 1Tb filesizes. Pages are now named by an
(object,index) pair instead of (object,offset) pair.
1995-12-11 04:58:34 +00:00
David Greenman
efeaf95a41 Untangled the vm.h include file spaghetti. 1995-12-07 12:48:31 +00:00
Poul-Henning Kamp
65d0bc1387 A couple of minor tweaks to the sysctl stuff. 1995-12-06 13:27:39 +00:00
Bruce Evans
98d938220c Completed function declarations and/or added prototypes. 1995-12-02 18:58:56 +00:00
Poul-Henning Kamp
2d0b1d708c A test was backwards.
Noticed by:	Cheng, Hsiao-Yang <sycheng@cis.ufl.edu>
1995-11-29 11:28:00 +00:00
Poul-Henning Kamp
4b2af45f4b Mega commit for sysctl.
Convert the remaining sysctl stuff to the new way of doing things.
the devconf stuff is the reason for the large number of files.
Cleaned up some compiler warnings while I were there.
1995-11-20 12:42:39 +00:00
Bruce Evans
986f4ce75e Fixed support for DIAGNOSTIC option. SYSCTL_INT() depends on kernel.h. 1995-11-16 09:45:23 +00:00
Poul-Henning Kamp
395e673587 Change some of the debug sysctl vars. The semantics of these will change. 1995-11-14 09:19:16 +00:00
Bruce Evans
ceba6236e0 Fixed type of vfs_free_netcred().
Removed redundant declaration of insmntque().
1995-11-11 00:27:00 +00:00
Bruce Evans
f57e65478d Introduced a type `vop_t' for vnode operation functions and used
it 1138 times (:-() in casts and a few more times in declarations.
This change is null for the i386.

The type has to be `typedef int vop_t(void *)' and not `typedef
int vop_t()' because `gcc -Wstrict-prototypes' warns about the
latter.  Since vnode op functions are called with args of different
(struct pointer) types, neither of these function types is any use
for type checking of the arg, so it would be preferable not to use
the complete function type, especially since using the complete
type requires adding 1138 casts to avoid compiler warnings and
another 40+ casts to reverse the function pointer conversions before
calling the functions.
1995-11-09 08:17:23 +00:00
John Dyson
5e527f652f This is a modification missed by me in the msync fixes a few days ago. 1995-11-07 05:09:43 +00:00
Bruce Evans
e887950a45 Call vfs_unbusy() before error returns from sysctl_vnode(). This fixes
PR 795.

Set the size before one error return from sysctl_vnode() the same as before
the other.  The caller might want to know about the amount successfully
read although the current caller doesn't.
1995-10-28 08:50:08 +00:00
Bruce Evans
430179f0c3 Don't compile the diagnostic functions vhold() and holdrele() unless
DIAGNOSTIC is defined.
1995-08-25 20:49:44 +00:00
David Greenman
628641f8a6 Converted mountlist to a CIRCLEQ.
Partially obtained from: 4.4BSD-Lite2
1995-08-11 11:31:18 +00:00
David Greenman
24a1cce34f NOTE: libkvm, w, ps, 'top', and any other utility which depends on struct
proc or any VM system structure will have to be rebuilt!!!

Much needed overhaul of the VM system. Included in this first round of
changes:

1) Improved pager interfaces: init, alloc, dealloc, getpages, putpages,
   haspage, and sync operations are supported. The haspage interface now
   provides information about clusterability. All pager routines now take
   struct vm_object's instead of "pagers".

2) Improved data structures. In the previous paradigm, there is constant
   confusion caused by pagers being both a data structure ("allocate a
   pager") and a collection of routines. The idea of a pager structure has
   escentially been eliminated. Objects now have types, and this type is
   used to index the appropriate pager. In most cases, items in the pager
   structure were duplicated in the object data structure and thus were
   unnecessary. In the few cases that remained, a un_pager structure union
   was created in the object to contain these items.

3) Because of the cleanup of #1 & #2, a lot of unnecessary layering can now
   be removed. For instance, vm_object_enter(), vm_object_lookup(),
   vm_object_remove(), and the associated object hash list were some of the
   things that were removed.

4) simple_lock's removed. Discussion with several people reveals that the
   SMP locking primitives used in the VM system aren't likely the mechanism
   that we'll be adopting. Even if it were, the locking that was in the code
   was very inadequate and would have to be mostly re-done anyway. The
   locking in a uni-processor kernel was a no-op but went a long way toward
   making the code difficult to read and debug.

5) Places that attempted to kludge-up the fact that we don't have kernel
   thread support have been fixed to reflect the reality that we are really
   dealing with processes, not threads. The VM system didn't have complete
   thread support, so the comments and mis-named routines were just wrong.
   We now use tsleep and wakeup directly in the lock routines, for instance.

6) Where appropriate, the pagers have been improved, especially in the
   pager_alloc routines. Most of the pager_allocs have been rewritten and
   are now faster and easier to maintain.

7) The pagedaemon pageout clustering algorithm has been rewritten and
   now tries harder to output an even number of pages before and after
   the requested page. This is sort of the reverse of the ideal pagein
   algorithm and should provide better overall performance.

8) Unnecessary (incorrect) casts to caddr_t in calls to tsleep & wakeup
   have been removed. Some other unnecessary casts have also been removed.

9) Some almost useless debugging code removed.

10) Terminology of shadow objects vs. backing objects straightened out.
    The fact that the vm_object data structure escentially had this
    backwards really confused things. The use of "shadow" and "backing
    object" throughout the code is now internally consistent and correct
    in the Mach terminology.

11) Several minor bug fixes, including one in the vm daemon that caused
    0 RSS objects to not get purged as intended.

12) A "default pager" has now been created which cleans up the transition
    of objects to the "swap" type. The previous checks throughout the code
    for swp->pg_data != NULL were really ugly. This change also provides
    the rudiments for future backing of "anonymous" memory by something
    other than the swap pager (via the vnode pager, for example), and it
    allows the decision about which of these pagers to use to be made
    dynamically (although will need some additional decision code to do
    this, of course).

13) (dyson) MAP_COPY has been deprecated and the corresponding "copy
    object" code has been removed. MAP_COPY was undocumented and non-
    standard. It was furthermore broken in several ways which caused its
    behavior to degrade to MAP_PRIVATE. Binaries that use MAP_COPY will
    continue to work correctly, but via the slightly different semantics
    of MAP_PRIVATE.

14) (dyson) Sharing maps have been removed. It's marginal usefulness in a
    threads design can be worked around in other ways. Both #12 and #13
    were done to simplify the code and improve readability and maintain-
    ability. (As were most all of these changes)

TODO:

1) Rewrite most of the vnode pager to use VOP_GETPAGES/PUTPAGES. Doing
   this will reduce the vnode pager to a mere fraction of its current size.

2) Rewrite vm_fault and the swap/vnode pagers to use the clustering
   information provided by the new haspage pager interface. This will
   substantially reduce the overhead by eliminating a large number of
   VOP_BMAP() calls. The VOP_BMAP() filesystem interface should be
   improved to provide both a "behind" and "ahead" indication of
   contiguousness.

3) Implement the extended features of pager_haspage in swap_pager_haspage().
   It currently just says 0 pages ahead/behind.

4) Re-implement the swap device (swstrategy) in a more elegant way, perhaps
   via a much more general mechanism that could also be used for disk
   striping of regular filesystems.

5) Do something to improve the architecture of vm_object_collapse(). The
   fact that it makes calls into the swap pager and knows too much about
   how the swap pager operates really bothers me. It also doesn't allow
   for collapsing of non-swap pager objects ("unnamed" objects backed by
   other pagers).
1995-07-13 08:48:48 +00:00
David Greenman
e0dca2b939 Improve negative usecount diagnostic a little. 1995-07-08 04:10:32 +00:00
David Greenman
aa2cabb958 1) Converted v_vmdata to v_object.
2) Removed unnecessary vm_object_lookup()/pager_cache(object, TRUE) pairs
   after vnode_pager_alloc() calls - the object is already guaranteed to be
   persistent.
3) Removed some gratuitous casts.
1995-06-28 12:01:13 +00:00
Bruce Evans
6acceb40dc Pass the correct nonblocking flag to VOP_CLOSE() in vclean().
VOP_CLOSE() takes `F' (file) flags, not `IO' flags.  At least that's
what close() passes.  I previously fixed ttylclose() to check
FNONBLOCK instead of IO_NDELAY.  This broke the call from vclean()
and cleaning of ptys sometimes deadlocked.
1995-06-27 21:29:08 +00:00